The song Norma sings in the nightclub, "Chicago, Illinois," includes the line "maybe some day we'll have an airport." The movie is set in 1933. Midway Airport began operations in 1927 and by 1929 was considered "the world's busiest airport" with over 100,000 passengers annually.
King asks Squash when Squash knew he was a homosexual. Squash replies that he always knew he was "gay". The film takes place in the 1930's. The word "gay" to describe a homosexual was not used until the 1970's.
The reaction shots of Andre and Toddy watching Victoria during her first "Shady Dame of Seville" number have them wearing the same boutonnières they wore during her very first show, but when Toddy and Victoria arrive back at the hotel Toddy has a different colored one.
In both scenes of "Shady Lady from Seville", first with Victoria, the second with Toddy, the stars in the window behind the fountain keep changing positions. During close-ups, the arrangement of the lights (stars) differ from distant shots. Only once did the camera position change while following Victoria, where otherwise it stayed in one position, and should not have effected the position of the stars.
In the second Chez Lui nightclub brawl scene, Madame President (the older woman who has her wig ripped off) is thrown up on the piano. When the piano collapses, it is clearly seen to be made out of balsa wood or a very thin laminate of some kind.
When Norma is attacking King in the hotel suite, and Squash steps in to protect him, Norma picks up a "decorative" spear and charges, unfortunately, she charges a bit too fast, because she has to take a quick pause (half step backwards) to allow Squash to slam the bedroom door, which she then pierces with the spear.